CRANKSHAFT, PISTON AND CYLINDER

Removing the decompression valve

Disconnect the pipe from the nipples (B and C). Use a ring spanner (15 mm) to remove the valve from the cylinder. Check that the valve can be pressed in easily and springs back out again. If the valve is stiff it should be soaked in petrol for a while to loosen the particles of soot. It can then be blown clean with compressed air.

Use a pressure tester to check that the non-return valve is working correctly. Air should only pass through in the direction of the arrow, see diagram. If the non-return valve is defective, replace it.

Fitting the decompression valve

Screw the valve into the cylinder using a ring spanner to a torque of 12–14 Nm. Then use a spanner to turn the brass part of the valve to roughly the position shown in the diagram, so that the pipe can be connected in the correct position.

The brass part is not threaded and can therefore be turned in either direction.

Pressure testing

The following parts must be removed to pressure test the crankcase and cylinder:

•Carburettor. See the chapter "Carburettor".

•Muffler. See the chapter "Safety equipment".

•Starter. See the chapter "Starter".

•Flywheel. See the chapter "Ignition system".

Carry out pressure testing as follows:

1.Fit the cover plate 502 52 01-01 on the inlet manifold. Now connect tool 502 50 38-01 to the cover plate.

2.Fit the cover plate 502 71 39-01 on the exhaust port.

3.Pull off the hose to the impulse channel and seal the nipple.

4.Pump up the pressure to 80 kPa (0.8 bar).

5.Wait 30 seconds.

6.The pressure must not fall below 60 kPa (0.6 bar).

7.Leakage can occur on the crankshaft’s sealing rings.

8.Dismantle the cover plates.

Assemble the following parts:

•Flywheel. See the chapter "Ignition system".

•Starter. See the chapter "Starter".

•Carburettor. See the chapter "Carburettor".

•Muffler. See the chapter "Safety equipment".

C

B

OK

OK

50 – English

Page 49 Page 51
Page 50
Image 50
Husqvarna 334T, 339XP, 338XPT, 336 manual Removing the decompression valve, Fitting the decompression valve, Pressure testing
Page 49 Page 51

338XPT, 334T, Chain Saw, 336, 339XP specifications

The Husqvarna 336 is a powerful and reliable chainsaw designed for both professional forestry work and demanding garden tasks. This versatile tool is ideal for users who value durability, performance, and ease of use. The 336 model stands out in the Husqvarna range thanks to its innovative features and cutting-edge technology.

One of the main highlights of the Husqvarna 336 is its efficient engine. Powered by a 34.6 cc, 2.6 kW engine, it strikes a balance between power and weight, ensuring that users can handle it comfortably during extended use. The X-Torq engine technology reduces fuel consumption and emissions, making it an environmentally-friendly option, while still delivering high performance.

The design of the Husqvarna 336 is crafted for maximum user comfort. The chainsaw features an ergonomic handle that ensures a secure and balanced grip, reducing fatigue during long periods of operation. Additionally, the lightweight design enhances maneuverability, allowing users to navigate through tight spaces and tackle challenging cuts with ease.

Safety is paramount in the design of the Husqvarna 336. The chainsaw is equipped with a quick-release air filter system, which makes maintenance simple and efficient. The chain brake works effectively to prevent accidents, and the chainsaw is fitted with a low-vibration system that minimizes vibrations felt by the user, improving overall comfort and control.

Another notable feature of the Husqvarna 336 is its intuitive controls, which allow users to quickly adjust settings and make necessary changes on the job. The model boasts an adjustable oil pump that lets users optimize chain lubrication based on the task at hand. This means improved efficiency and extended chain life, ultimately saving users both time and money.

The chainsaw also incorporates an easy-start mechanism, reducing the effort required to start the engine. This makes the Husqvarna 336 a practical choice for users of all skill levels, from seasoned professionals to beginners looking to tackle their first projects.

In summary, the Husqvarna 336 is a standout chainsaw that combines power, comfort, and advanced technology. Its features, including the X-Torq engine, ergonomic design, safety elements, and ease of maintenance, make it an excellent investment for anyone serious about forestry work or outdoor upkeep. Whether pruning trees, cutting firewood, or felling small trees, the Husqvarna 336 excels in performance and reliability, ensuring users get the job done efficiently and effectively.
Top Page Image Contents